Bicycle propulsion



No. 6|0-,I29. Patented Aug. 3U, |898. E. W. ERICSUN.

BICYCLE PROPULSION.

(,Application led Feb. 15, 1898.)

(No Model.)

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BICYCLE PROPULSION.

SPECIFICATION forming part Of` Letters Patent N0. 610,129, dated August30, 1898.. Application filed February 15, 1898. Serial No. 670,374. (Nomodel.)

To all whom t may concern.-

Beit known that I, ERIC NV. ERICSON, a citizen of the United States,residing at Florence, in the county of Florence and State of Wisconsin,have invented certain new and useful Improvements in Bicycle Propulsion;and I do declare the following to be a full,

clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to the letters of reference marked thereon, which form a part ofthis specification.

This invention relates to new and useful mechanical improvements whichare especially adapted for bicycles, but may be applied to any mechanismwherein it may be found to be adapted for use.

More specifically, the invention resides in the provision of a pitmanwhich is actuated by means of a rotary disk having lugs on the facethereof which travel on the margin of an angular aperture in an enlargedportion of the pitman, which disk is keyed to the pedalshaft and adaptedat each revolution of the disk to impart a multiplied motion to the rearWheel of the bicycle, the pitman having a sliding Contact withantifriction-rollers which are mounted in a suitable casing forming apart of the machine.

The invention will be more clearly understood when taken in connectionwith the drawings which form a part of this application, and in whichdrawings similar letters of reference indicate like parts throughoutboth views, in which- Figure l is a side elevation of a bicycle, showingmy improved propelling mechanism attached thereto. Fig. 2 is an enlargeddetail in elevation of the pitman, showingthe manner of its connectionwith the rotary disk and the antifriction-rollers on the disk and on thecasing, between which the pitman reciprocates, the said view showing theside of the casing removed.

Reference now being had to the details of the drawings by letter, Adesignates the pedalshaft, to which the pedals B are keyed in the usualmanner. This shaft has keyed thereto the disk C, which carries about onone of its faces the lugs D, on which lugs are mounted These lugs arearantifriction-rollers D.

ranged, as shown, equidistant on the face of the disk, and E is a pitmanwhich has an en- 5 larged end E,vwhi ch is apertured, having the lfourrounded corners Gand the convex sides ers L, and its contracted forwardend is piv-V oted to a crank M, which is keyed to the shaft N, whichforms the axis of the rear wheel of the bicycle. Y

Q is a covering to the casing, which carries the propelling mechanismand is secured thereto in any suitable manner.

From the foregoing it will be noted that at each revolution of the diskcarrying the lugs the driving-wheel will have made several revolutionsand the dead-center will be overcome at any position at which the disk,which is actuated by the pedal-shaft, may be disposed.

While I have shown my propelling mechanism as connected to a bicycle, itWill be understood that it may be equally well adapted for use inconnection with machines of different kinds, andI do not limit myself toany particular use of the same. l

Having thus described my invention, what I claim to be new, and desireto secure by Letters Patent, is-

In a propelling mechanism for bicycles, the combination with thepedal-shaft, the disk mountedV thereon, lugs on the face thereof,antifriction-rollers on the said lugs, the pitman, having an opening oraperture in its broadened end, with an irregular margin forming a trackon which the said antifriction-rollers are adapted to travel when thedisk is rotated, andA the antifriction-rollers mounted on the casingcarrying the pitman, and between which rollers the pitman is guided inits reciprocating movements, and the crank pivoted to the end of thepitman, as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

ERIC ERIOSON.

Witnesses:

J. E. PARRY, JAMES PONTBRIAND.

IOO

